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Operation
Power Supply Operation
Release 2.1 53
Additional
Protections
Other protection mechanisms designed to protect the power supply are:
• AC Off: Disables the output if the AC line drops below the acceptable range.
• Sense Protection: Disables the output when the internal sense circuit is tripped
by either reversed polarity at the output of the supply or a high voltage present
at the output.
• Output Fail: Disables the output if the bridge circuit fails. This is a hardware
protection circuit and has no associated software controls.
Set
Shutdown
Recovery for
AC Off
There are two options for AC Off (ACO) and Over-Temperature protection (OTP):
• Auto-Recovery: With this method, the power supply returns to its normal
operating state once the alarm condition no longer exists. For example, if there
was an over-temperature alarm and the protection was set to auto-recovery, the
power supply would return to its normal operating state once the temperature
was reduced below the alarm level.
• Latched: With this method, the power supply remains in Shutdown state until
the operator manually clears the protection and manually turns the output back
on.
AC Off
Protection
The user has the option of setting whether the AC Off protection mechanism is
latched or automatically resumes operation.
SENSe:VOLT:AC:PROT:LATCH {ON|1|OFF|0}
Where:
• ON or 1 means the supply will be latched in shut down if an AC Off condition
occurs, until the user re-enables the output, and
• OFF or 0 means the supply will automatically resume operation when the AC
line input returns to normal.
The default value is OFF.
To query if AC Off has tripped:
SENSE:VOLT:AC:PROT:TRIP?
Over
Temperature
Protection
The user has the option of setting whether the OTP mechanism is latched or
automatically resumes operation.
SENSe:TEMP:PROT:LATCH {ON|1|OFF|0}
The default value is ON.
To query if OTP has tripped:
SENSE:TEMP:PROT:TRIP?